# SDP nginx — serves the static NextJS export and proxies API + WS
# to the Go control plane.
#
# try_files: any unknown path falls back to /index.html so client-side
# routing works. /api and /ws are matched first and proxied upstream.

upstream control_plane {
    server 127.0.0.1:8080;
    keepalive 16;
}

server {
    listen 80;
    server_name _;

    # Long-lived WS connections need a generous read timeout.
    proxy_read_timeout 3600s;
    proxy_send_timeout 3600s;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    # --- API: control plane ---
    location /api/ {
        proxy_pass http://control_plane;
    }

    # --- WebSocket: agent + dashboard subscriptions ---
    location /ws/ {
        proxy_pass http://control_plane;
    }

    # --- Static dashboard ---
    root /var/www/sdp/dashboard/out;
    index index.html;

    # ponytail: try_files does all the work. _next chunks, images, etc. are
    # served as files; unknown paths fall back to /index.html for SPA routing.
    location / {
        try_files $uri $uri/ $uri.html /index.html;
    }

    # Cache static assets aggressively; never cache index.html.
    location /_next/static/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}